public void NotificationExtensions_PublishError_SetsErrorLevelAtNotification()
{
bool success = false;
var notificator = new Notificator();
(notificator as INotificationListener).Notifications
.Take(1)
.Where(x => x.Level == NotificationLevel.Error)
.Subscribe(_ => success = true);
notificator.PublishError("Test");
Assert.True(success);
}